add small test runnable with 'nosetests bwameth.py'
add small test runnable with 'nosetests bwameth.py'

PeteHaitch/bwa-parclip,PeteHaitch/bwa-parclip,PeteHaitch/bwa-parclip,dariober/bwa-meth,brentp/bwa-meth,brentp/bwa-meth,dariober/bwa-meth,brentp/bwa-meth,dariober/bwa-meth